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Interrogation of a long-period grating using a mechanically scannable arrayed waveguide grating and a sampled chirped
Honglei Guo1, Yitang Dai, Gaozhi Xiao
1Microwave Photonics Research Laboratory, School of Information Technology and Engineering, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
Optics Letters
|August 2, 2008
Summary
A new method uses a mechanically scanned arrayed waveguide grating to precisely measure long-period gratings. This fiber optic sensing technique achieves high resolution and speed for advanced applications.
Area of Science:
- Optics and Photonics
- Fiber Optic Sensing
- Interferometry
Background:
- Long-period gratings (LPGs) are crucial optical fiber sensors.
- Accurate interrogation of LPGs is essential for precise measurements.
- Existing interrogation techniques face limitations in resolution and speed.
Purpose of the Study:
- To propose a novel technique for interrogating LPGs.
- To implement a system based on space-to-wavelength mapping using a mechanically scannable arrayed waveguide grating (AWG).
- To demonstrate high-resolution and high-speed measurement of LPG central wavelengths.
Main Methods:
- Utilizing a mechanically scannable AWG for space-to-wavelength mapping.
- Employing a sampled chirped fiber Bragg grating with multiple peaks as a wavelength reference.
- Scanning the input light beam along the AWG input coupler facet.
Main Results:
- Demonstrated an interrogation system with a resolution of 10 pm.
- Achieved a measurement speed of 10 Hz.
- Showcased potential for subpicometer resolution at 500 Hz.
Conclusions:
- The proposed technique offers a viable method for high-resolution LPG interrogation.
- The system demonstrates significant improvements in speed and resolution compared to conventional methods.
- This advancement holds promise for various fiber optic sensing applications requiring precise wavelength monitoring.
